Is it better that the seller's mortgage gets paid (by someone else) and the property turned into a rental or should the seller simply 'walk away" and stop making payments and the property become vacant ?

@Sohail Ahmed Jokhio from your questions, it appears you are looking at real estate investing as a "job" or a university curriculum.There's NOTHING stopping you from accessing everything you need online - except the limits of your perceptions.Not aware of anyone here that's going to be your guidance conselor and lay out what you're asking for.

Why did the previous clients stop working with them?

Stop hanging out with your deadbeat buddies that spend all day drinking, talking sports, and otherwise wasting away.

Stop hanging out with your deadbeat buddies that spend all day drinking, talking sports, and otherwise wasting away.

U would be tresspassing if you go on the property.. although me personally I never let that stop me. 

My income has dropped significantly bc I chose to sell my business and take a more relaxed job so I would stop killing myself.  

I went there to drop off something for a person working there and, stopped in my tracks! 

Switched to a kwikset halo and it stopped the issue.

If your tenant stops paying or trashes the place, you could incur another $10,000 - $20,000 in one year, on top of the $36,000 you are already losing.